Swell.is - Customizable, API-first ecommerce platform for innovative brands, startups, and agencies.
MuseScore.org - Create, play back and print beautiful sheet music with free and easy to use music notation software MuseScore. For Windows, Mac and Linux.
Vendure - Open-source headless e-commerce framework for developers
Guitar Pro 7 - Create, play and share your tabs
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.